Heat oven to 350.
Line 13x9 inch pan with foil, with ends of foil extending over sides. Microwave butter in large microwaveable bowl on HIGH 1 to 1 1/2 minutes or until melted. Add cake mix and egg; beat with mixer until well blended. Press 2/3 of the mixture onto bottom of prepared pan.
Beat cream cheese and sugar with mixer until well blended. Add remaining egg, zest and juice; mix well. Pour over crust; top with berries. Pinch small pieces of the remaining cake mix mixture between your fingers; press lightly into cream cheese layer.
Bake 55 minutes to 1 hour or until toothpick inserted in enter comes out clean. Cool completely. Use foil handles to lift dessert from pan before cutting into bars. Keep refigerated.